Rubber tire.



PATENTED OCT. 23

. A. H. MARKS. RUBBER TIRE. APPLIOATION FILED NOV. 17. 1905 UNITED STATES ARTHUR H. MARKS, OF AKRON, OHIO,

PATENT oFFroE.

ASSIGNOR To THE DIAMOND RUBBER CONIPANY,'OF AKRON,. ()HIO, A CORPORATION OF OHIO.

' I RUBBER TIRE.

Specification of Letters Patent.

, 1'0 all "Lu/110m 216- may] concern:

Be itknown that I, ARTHUR HJMARKs, a citizen of the United States, residing at Akron, in the county of Summit and. State of Ohio, have invented a certain new and useful Im rovement in liubber 'lires, of which the fol owin is a full, clear, and exact de scription, re erence being bad to the'accompanying drawings.

Rubber tires for vehicle-wheels are subjected to very severe strains in use, and as such tires have been made heretofore they wear out far too rapidly to satisfy users.

Vulcanized rubber tires when held on the rim-by wires or metal bands which are not embedded in the rubber before it is vuleam ized are the least durable, because immediately their use is begun a chafing of the rubber upon the metal begins, due to the movement of the rubber under the strainsof use, and this chating results in ra id destructive wear oi the rubber tires. hose forms of rubber tires in which wires or wire fabric for strengthening them a re embedded before vulcanization and to which therefore the rubber becomes attached during the process ol vulcanization are the most durable; but even with these tires as herctol'ore constructial the strains of use will sooner or later loosen the rubber from the wires, whereupon the same relative movement begins and the same chating and dcstruct ivc wear results.

The tire embodying the present invention, as hb-rcinaltcr described,-is the resultant oi" many experiments carried on for the purpose of discovering means for minii'nizing and. it possible, eliminating said destructive action without reducing the resilicncv oithe tire as a whole;

'lhe inventionconsists ol' a tire having a tread port-ion made ol' resilient vulcanized rubber and a base portion made up oi alternate layers of \\'o\'cn\\irc l'abric and Vulcan'- izcd rubber, which is much lirnicr and less resilient than the rubber ol whichlhc tread ismade, (said rubber in the base being extended through, so as to till the interstices ol" the wire l'abriig') and a substantial zone-oi" rubber which is 'lirnicr and less resilient than the tread portion, which zone is vulcanized between the tread mrtion and hat part ol the. rubber ol' the muse in which said wire fabric is embedded, as described.

in the drawings, Figure 1 is a transverse sectional view of the improved tire in which the invention is embodied, and Fig. 2 is a side View of the tire complete.

Referring to the parts b letters, A represents the tread portion of t e tire, which may be of any desired shapeand may be made of any resilient rubber compound such, for

struction of rubber tires. The base B of the tire is made of rubber, which when vulcanized. is very much firmer, tougher, and less resilient than the tread, and in thisbase are embedded a plurality of layers of open-work 'metal, preferably, of course, woven-Wire fab-- of the unvulcanized rubber, and the wire fabric and the rubber is by pressure caused to flow into and -till the interstices of the fabric. Between this base, made up, as stated, of rubber which has comparatively little resiliency and the stitl'ening wire fabric embedded less resilient than the rubber of the tread. It may be the samein quality as the rubber of which the base is made; but the base because it is still'encd by the wire fabric is practically non-resilient while this zone I), being not stitl'encd by the wire fabric, has enough resiliency to enable it to serve the important purpose of absorbing the! moveinent of the tread portion resulting from the strains of use.

it is dillicult, it not impossible, to express by mere words the precise degree of resiliency of the various parts of the described tire. In fact, it is not desired to definitely limit the ency, as a wide variation in that regard is permissible. Sieaking generally, the base rubber should have so little resiliency that when reinlbreed by the wire fabric the base as a whole becomes practically non-resilient.

sired. The zone I) should be of such thickness and have such degree of' resiliency that it will absorb without transmitting it to the base portion the movementoi the tread portiou. Practically the desired results may be her compound containing about six per cent. i of sulfur, while the rubber for the base porlion and for the zone I) may contain about example, as is commonly used in the con-- ric C. The base is built up of alternate plies therein, there is a zone I), of rubber, which is invention to any particular degrees of rcsili-,

'lhe tread portion ma boas resilient as de- Patented Oct.23, 1906. v

attained by using for the tread portion a rubtwelve per cent. olsullur and about five.per

ccnl. ,ol oxid of iron, and the zone may be :T lo f the drawings shows a convenient wa of holding the .tire, which when comle'ted is an annulusupon'the 'wheel-felly E; he means consists of two lates F, secured toopposite faces ofthe fel y and extending outward-against the sides of'the'tire The tire above described is of course constructed of .unvulcanized 'rubben'and all of "the; parts thereof become firmly united during"-*wlcanization; "The resiliency" of the 'tre'a'dj' ortionandof thefinnerrub er in the won e. imrirediatelyadjac'ent to'their plane ofjumom Will-have their resilient qualities slightlymodified during vulcanization by reason of their juxtaposition, whereby there will be no abrupt transition in resilient qualities between them.

- Having thus described, II1 invention, I claim-- A rubber tire com osed of a tread portion made of resilient rubber, a base ortion made of firmer and less resilient rub er, in which a plurality of plies of o en-work metal fabric is embedded, and a su stantial zone of rubber of less resiliency than the tread, which is vulcanized betweenthe tread and the base.

" "In testimony whereof I hereunto affix-my signature in the-presence of two witnesses.

ARTHUR H. MARKS.

" Witnesses:

' E. LTHURSTON,

N. L. BRESNAN. 

